160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "keylog.h"
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#include <curl/curl.h>
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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#define KEYLOG_LABEL_MAXLEN (sizeof("CLIENT_HANDSHAKE_TRAFFIC_SECRET") - 1)
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#define CLIENT_RANDOM_SIZE 32
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/*
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* The master secret in TLS 1.2 and before is always 48 bytes. In TLS 1.3, the
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* secret size depends on the cipher suite's hash function which is 32 bytes
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* for SHA-256 and 48 bytes for SHA-384.
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*/
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#define SECRET_MAXLEN 48
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/* The fp for the open SSLKEYLOGFILE, or NULL if not open */
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static FILE *keylog_file_fp;
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void
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Curl_tls_keylog_open(void)
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{
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char *keylog_file_name;
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if(!keylog_file_fp) {
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keylog_file_name = curl_getenv("SSLKEYLOGFILE");
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if(keylog_file_name) {
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keylog_file_fp = fopen(keylog_file_name, FOPEN_APPENDTEXT);
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if(keylog_file_fp) {
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#ifdef WIN32
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if(setvbuf(keylog_file_fp, NULL, _IONBF, 0))
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#else
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if(setvbuf(keylog_file_fp, NULL, _IOLBF, 4096))
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#endif
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{
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fclose(keylog_file_fp);
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keylog_file_fp = NULL;
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}
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}
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Curl_safefree(keylog_file_name);
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}
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}
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}
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void
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Curl_tls_keylog_close(void)
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{
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if(keylog_file_fp) {
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fclose(keylog_file_fp);
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keylog_file_fp = NULL;
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}
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}
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bool
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Curl_tls_keylog_enabled(void)
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{
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return keylog_file_fp != NULL;
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}
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bool
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Curl_tls_keylog_write_line(const char *line)
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{
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/* The current maximum valid keylog line length LF and NUL is 195. */
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size_t linelen;
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char buf[256];
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if(!keylog_file_fp || !line) {
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return false;
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}
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linelen = strlen(line);
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if(linelen == 0 || linelen > sizeof(buf) - 2) {
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/* Empty line or too big to fit in a LF and NUL. */
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return false;
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}
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memcpy(buf, line, linelen);
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if(line[linelen - 1] != '\n') {
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buf[linelen++] = '\n';
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}
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buf[linelen] = '\0';
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/* Using fputs here instead of fprintf since libcurl's fprintf replacement
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may not be thread-safe. */
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fputs(buf, keylog_file_fp);
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return true;
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}
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bool
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Curl_tls_keylog_write(const char *label,
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const unsigned char client_random[CLIENT_RANDOM_SIZE],
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const unsigned char *secret, size_t secretlen)
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{
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const char *hex = "0123456789ABCDEF";
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size_t pos, i;
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char line[KEYLOG_LABEL_MAXLEN + 1 + 2 * CLIENT_RANDOM_SIZE + 1 +
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2 * SECRET_MAXLEN + 1 + 1];
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if(!keylog_file_fp) {
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return false;
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}
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pos = strlen(label);
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if(pos > KEYLOG_LABEL_MAXLEN || !secretlen || secretlen > SECRET_MAXLEN) {
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/* Should never happen - sanity check anyway. */
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return false;
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}
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memcpy(line, label, pos);
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line[pos++] = ' ';
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/* Client Random */
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for(i = 0; i < CLIENT_RANDOM_SIZE; i++) {
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line[pos++] = hex[client_random[i] >> 4];
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line[pos++] = hex[client_random[i] & 0xF];
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}
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line[pos++] = ' ';
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/* Secret */
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for(i = 0; i < secretlen; i++) {
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line[pos++] = hex[secret[i] >> 4];
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line[pos++] = hex[secret[i] & 0xF];
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}
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line[pos++] = '\n';
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line[pos] = '\0';
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/* Using fputs here instead of fprintf since libcurl's fprintf replacement
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may not be thread-safe. */
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fputs(line, keylog_file_fp);
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return true;
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}
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